For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Guillaume_G:branches:devel:languages:D/openSUSE_Tumbleweed/home:Guillaume_G:branches:devel:languages:D.repo
zypper refresh
zypper install ldc
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Guillaume_G:branches:devel:languages:D/openSUSE_Factory_ARM/home:Guillaume_G:branches:devel:languages:D.repo
zypper refresh
zypper install ldc